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import sys
import textwrap

from pyflakes import messages as m
from pyflakes.checker import (
    PYPY,
    DoctestScope,
    FunctionScope,
    ModuleScope,
)
from pyflakes.test.test_other import Test as TestOther
from pyflakes.test.test_imports import Test as TestImports
from pyflakes.test.test_undefined_names import Test as TestUndefinedNames
from pyflakes.test.harness import TestCase, skip

class _DoctestMixin:

withDoctest = True

def doctestify(self, input):
        lines = []
        for line in textwrap.dedent(input).splitlines():
            if line.strip() == '':
                pass
            elif (line.startswith(' ') or
                  line.startswith('except:') or
                  line.startswith('except ') or
                  line.startswith('finally:') or
                  line.startswith('else:') or
                  line.startswith('elif ') or
                  (lines and lines[-1].startswith(('>>> @', '... @')))):
                line = "... %s" % line
            else:
                line = ">>> %s" % line
            lines.append(line)
        doctestificator = textwrap.dedent('''\
            def doctest_something():
                """
                   %s
                """
            ''')
        return doctestificator % "\n       ".join(lines)

def flakes(self, input, *args, **kw):
        return super().flakes(self.doctestify(input), *args, **kw)

class Test(TestCase):

withDoctest = True

def test_scope_class(self):
        """Check that a doctest is given a DoctestScope."""
        checker = self.flakes("""
        m = None

def doctest_stuff():
            '''
                >>> d = doctest_stuff()
            '''
            f = m
            return f
        """)

scopes = checker.deadScopes
        module_scopes = [
            scope for scope in scopes if scope.__class__ is ModuleScope]
        doctest_scopes = [
            scope for scope in scopes if scope.__class__ is DoctestScope]
        function_scopes = [
            scope for scope in scopes if scope.__class__ is FunctionScope]

self.assertEqual(len(module_scopes), 1)
        self.assertEqual(len(doctest_scopes), 1)

module_scope = module_scopes[0]
        doctest_scope = doctest_scopes[0]

self.assertIsInstance(doctest_scope, DoctestScope)
        self.assertIsInstance(doctest_scope, ModuleScope)
        self.assertNotIsInstance(doctest_scope, FunctionScope)
        self.assertNotIsInstance(module_scope, DoctestScope)

self.assertIn('m', module_scope)
        self.assertIn('doctest_stuff', module_scope)

self.assertIn('d', doctest_scope)

self.assertEqual(len(function_scopes), 1)
        self.assertIn('f', function_scopes[0])

def test_nested_doctest_ignored(self):
        """Check that nested doctests are ignored."""
        checker = self.flakes("""
        m = None

def doctest_stuff():
            '''
                >>> def function_in_doctest():
                ...     \"\"\"
                ...     >>> ignored_undefined_name
                ...     \"\"\"
                ...     df = m
                ...     return df
                ...
                >>> function_in_doctest()
            '''
            f = m
            return f
        """)

self.assertEqual(len(module_scopes), 1)
        self.assertEqual(len(doctest_scopes), 1)

module_scope = module_scopes[0]
        doctest_scope = doctest_scopes[0]

self.assertIn('m', module_scope)
        self.assertIn('doctest_stuff', module_scope)
        self.assertIn('function_in_doctest', doctest_scope)

self.assertEqual(len(function_scopes), 2)

self.assertIn('f', function_scopes[0])
        self.assertIn('df', function_scopes[1])

def test_global_module_scope_pollution(self):
        """Check that global in doctest does not pollute module scope."""
        checker = self.flakes("""
        def doctest_stuff():
            '''
                >>> def function_in_doctest():
                ...     global m
                ...     m = 50
                ...     df = 10
                ...     m = df
                ...
                >>> function_in_doctest()
            '''
            f = 10
            return f

""")

self.assertEqual(len(module_scopes), 1)
        self.assertEqual(len(doctest_scopes), 1)

module_scope = module_scopes[0]
        doctest_scope = doctest_scopes[0]

self.assertIn('doctest_stuff', module_scope)
        self.assertIn('function_in_doctest', doctest_scope)

self.assertEqual(len(function_scopes), 2)

self.assertIn('f', function_scopes[0])
        self.assertIn('df', function_scopes[1])
        self.assertIn('m', function_scopes[1])

self.assertNotIn('m', module_scope)

def test_global_undefined(self):
        self.flakes("""
        global m

def doctest_stuff():
            '''
                >>> m
            '''
        """, m.UndefinedName)

def test_nested_class(self):
        """Doctest within nested class are processed."""
        self.flakes("""
        class C:
            class D:
                '''
                    >>> m
                '''
                def doctest_stuff(self):
                    '''
                        >>> m
                    '''
                    return 1
        """, m.UndefinedName, m.UndefinedName)

def test_ignore_nested_function(self):
        """Doctest module does not process doctest in nested functions."""
        # 'syntax error' would cause a SyntaxError if the doctest was processed.
        # However doctest does not find doctest in nested functions
        # (https://bugs.python.org/issue1650090). If nested functions were
        # processed, this use of m should cause UndefinedName, and the
        # name inner_function should probably exist in the doctest scope.
        self.flakes("""
        def doctest_stuff():
            def inner_function():
                '''
                    >>> syntax error
                    >>> inner_function()
                    1
                    >>> m
                '''
                return 1
            m = inner_function()
            return m
        """)

def test_inaccessible_scope_class(self):
        """Doctest may not access class scope."""
        self.flakes("""
        class C:
            def doctest_stuff(self):
                '''
                    >>> m
                '''
                return 1
            m = 1
        """, m.UndefinedName)

def test_importBeforeDoctest(self):
        self.flakes("""
        import foo

def doctest_stuff():
            '''
                >>> foo
            '''
        """)

@skip("todo")
    def test_importBeforeAndInDoctest(self):
        self.flakes('''
        import foo

def doctest_stuff():
            """
                >>> import foo
                >>> foo
            """

foo
        ''', m.RedefinedWhileUnused)

def test_importInDoctestAndAfter(self):
        self.flakes('''
        def doctest_stuff():
            """
                >>> import foo
                >>> foo
            """

import foo
        foo()
        ''')

def test_offsetInDoctests(self):
        exc = self.flakes('''

def doctest_stuff():
            """
                >>> x # line 5
            """

''', m.UndefinedName).messages[0]
        self.assertEqual(exc.lineno, 5)
        self.assertEqual(exc.col, 12)

def test_offsetInLambdasInDoctests(self):
        exc = self.flakes('''

def doctest_stuff():
            """
                >>> lambda: x # line 5
            """

''', m.UndefinedName).messages[0]
        self.assertEqual(exc.lineno, 5)
        self.assertEqual(exc.col, 20)

def test_offsetAfterDoctests(self):
        exc = self.flakes('''

def doctest_stuff():
            """
                >>> x = 5
            """

''', m.UndefinedName).messages[0]
        self.assertEqual(exc.lineno, 8)
        self.assertEqual(exc.col, 0)

def test_syntaxErrorInDoctest(self):
        exceptions = self.flakes(
            '''
            def doctest_stuff():
                """
                    >>> from # line 4
                    >>>     fortytwo = 42
                    >>> except Exception:
                """
            ''',
            m.DoctestSyntaxError,
            m.DoctestSyntaxError,
            m.DoctestSyntaxError).messages
        exc = exceptions[0]
        self.assertEqual(exc.lineno, 4)
        if not PYPY and sys.version_info >= (3, 8):
            self.assertEqual(exc.col, 18)
        else:
            self.assertEqual(exc.col, 26)

# PyPy error column offset is 0,
        # for the second and third line of the doctest
        # i.e. at the beginning of the line
        exc = exceptions[1]
        self.assertEqual(exc.lineno, 5)
        if PYPY:
            self.assertEqual(exc.col, 13)
        else:
            self.assertEqual(exc.col, 16)
        exc = exceptions[2]
        self.assertEqual(exc.lineno, 6)
        if PYPY or sys.version_info >= (3, 8):
            self.assertEqual(exc.col, 13)
        else:
            self.assertEqual(exc.col, 18)

def test_indentationErrorInDoctest(self):
        exc = self.flakes('''
        def doctest_stuff():
            """
                >>> if True:
                ... pass
            """
        ''', m.DoctestSyntaxError).messages[0]
        self.assertEqual(exc.lineno, 5)
        if PYPY or sys.version_info >= (3, 8):
            self.assertEqual(exc.col, 13)
        else:
            self.assertEqual(exc.col, 16)

def test_offsetWithMultiLineArgs(self):
        (exc1, exc2) = self.flakes(
            '''
            def doctest_stuff(arg1,
                              arg2,
                              arg3):
                """
                    >>> assert
                    >>> this
                """
            ''',
            m.DoctestSyntaxError,
            m.UndefinedName).messages
        self.assertEqual(exc1.lineno, 6)
        self.assertEqual(exc1.col, 19)
        self.assertEqual(exc2.lineno, 7)
        self.assertEqual(exc2.col, 12)

def test_doctestCanReferToFunction(self):
        self.flakes("""
        def foo():
            '''
                >>> foo
            '''
        """)

def test_doctestCanReferToClass(self):
        self.flakes("""
        class Foo():
            '''
                >>> Foo
            '''
            def bar(self):
                '''
                    >>> Foo
                '''
        """)

def test_noOffsetSyntaxErrorInDoctest(self):
        exceptions = self.flakes(
            '''
            def buildurl(base, *args, **kwargs):
                """
                >>> buildurl('/blah.php', ('a', '&'), ('b', '=')
                '/blah.php?a=%26&b=%3D'
                >>> buildurl('/blah.php', a='&', 'b'='=')
                '/blah.php?b=%3D&a=%26'
                """
                pass
            ''',
            m.DoctestSyntaxError,
            m.DoctestSyntaxError).messages
        exc = exceptions[0]
        self.assertEqual(exc.lineno, 4)
        exc = exceptions[1]
        self.assertEqual(exc.lineno, 6)

def test_singleUnderscoreInDoctest(self):
        self.flakes('''
        def func():
            """A docstring

>>> func()
            1
            >>> _
            1
            """
            return 1
        ''')

def test_globalUnderscoreInDoctest(self):
        self.flakes("""
        from gettext import ugettext as _

def doctest_stuff():
            '''
                >>> pass
            '''
        """, m.UnusedImport)

class TestOther(_DoctestMixin, TestOther):
    """Run TestOther with each test wrapped in a doctest."""

class TestImports(_DoctestMixin, TestImports):
    """Run TestImports with each test wrapped in a doctest."""

class TestUndefinedNames(_DoctestMixin, TestUndefinedNames):
    """Run TestUndefinedNames with each test wrapped in a doctest."""

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